Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (loss) recognized due to ineffectiveness of hedges of interest rate risk	$ 0	$ 0	$ 0	$ 0
Additional amount expected to be reclassified from AOCI into earnings during next twelve months	4,145,000		4,145,000
Fair value of derivatives in a net liability position	$ 3,240,000		$ 3,240,000